94 lines
2.3 KiB
C
94 lines
2.3 KiB
C
/*
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VTun - Virtual Tunnel over TCP/IP network.
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Copyright (C) 1998-2008 Maxim Krasnyansky <max_mk@yahoo.com>
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VTun has been derived from VPPP package by Maxim Krasnyansky.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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*/
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/*
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* $Id: linkfd.h,v 1.4.2.3 2008/01/07 22:35:45 mtbishop Exp $
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*/
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#ifndef _LINKFD_H
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#define _LINKFD_H
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/* Priority of the process in the link_fd function */
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/* Never set the priority to -19 without stating a good reason.
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*#define LINKFD_PRIO -19
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* Since the likely intent was just to give vtun an edge,
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* -1 will do nicely.
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*/
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#define LINKFD_PRIO -1
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/* Frame alloc/free */
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#define LINKFD_FRAME_RESERV 128
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#define LINKFD_FRAME_APPEND 64
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static inline void * lfd_alloc(size_t size)
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{
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register char * buf;
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size += LINKFD_FRAME_RESERV + LINKFD_FRAME_APPEND;
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if( !(buf = malloc(size)) )
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return NULL;
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return buf+LINKFD_FRAME_RESERV;
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}
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static inline void * lfd_realloc(void *buf, size_t size)
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{
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unsigned char *ptr = buf;
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ptr -= LINKFD_FRAME_RESERV;
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size += LINKFD_FRAME_RESERV;
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if( !(ptr = realloc(ptr, size)) )
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return NULL;
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return ptr+LINKFD_FRAME_RESERV;
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}
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static inline void lfd_free(void *buf)
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{
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unsigned char *ptr = buf;
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free(ptr-LINKFD_FRAME_RESERV);
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}
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int linkfd(struct vtun_host *host);
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/* Module */
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struct lfd_mod {
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char *name;
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int (*alloc)(struct vtun_host *host);
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int (*encode)(int len, char *in, char **out);
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int (*avail_encode)(void);
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int (*decode)(int len, char *in, char **out);
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int (*avail_decode)(void);
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int (*free)(void);
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struct lfd_mod *next;
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struct lfd_mod *prev;
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};
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/* External LINKFD modules */
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extern struct lfd_mod lfd_zlib;
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extern struct lfd_mod lfd_lzo;
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extern struct lfd_mod lfd_encrypt;
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extern struct lfd_mod lfd_legacy_encrypt;
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extern struct lfd_mod lfd_shaper;
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#endif
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